No Spoilers, just some pros and cons.
Pros
The acting was very good. I would call out Kim Kyung-Chul for his portrayal of Sea In-Ho, the jerk husband. Of course we don't like his character, but he did a truly superb job of navigating jerkiness and having regret. I would also call out Jo Adam for her role as Jeon So-Ra. It looks like she does not have a lot of acting experience, but the way she portrayed a cranky, domineering personality was quite subtle and skillful.
I liked the storyline and the message they were trying to communicate.
Everything that happened in the story was believable, even if unlikely.
Cons
Somehow the series did not draw my wife and I in as much as our favorite KDramas. Despite some touching scenes, we were not too emotionally invested in the characters.
The ending was O. K., and I think sent a nice message, but again we were sort of just, "Oh, it's over. What will we watch next?" Rather than feeling like we would miss the story and characters. The story just sputtered to a halt. There a number of things they could have done to tie everything up to a greater extent.
So overall, not bad, but not great. So a 7 ranking.